var html = document.getElementsByTagName('html')[0];
window.onresize = init;
function init() {
	var hw = html.offsetWidth;
	var n = hw <= 320 ? 20 : 20 / 320 * hw;
	html.style.fontSize = n + "px";
}init();
html.ontouchstart = function (e) {
	event.stopPropagation();
}
html.onclick = function(e) {
	event.stopPropagation();
}
html.ontouchmove = function (e) {
	event.stopPropagation();
	event.preventDefault();
}
html.ontouchend = function (e) {
	event.stopPropagation();
}